Lithographic machine.



- No. 633,958. Patented Sept. 26, 1899.. J. c. HALLIGAN.

LITHOGBAPHIC MACHINE.

{Applicl-tioix filed Feb. 10, 1899.) (l lo llodoi.)

3 n-ueu tot ,HALLIGAN, a subject of the Queen of Great- UNITED STATES PATENT OFFICE;

JAMES CHRISTOPHER HALLIGAN, OFBRISBANE, QUEENSLAND, ASSIGNOR OF ONE-HALE TO JAMES FERGUSON, OF SAME. PLACE.

LITHOGRAPHIC MACHINE.

SPECIFICATION-forming part of Letters Patent No. 633,958, dated September 26, 1899.

Application filed February 10, 1899. Serial No. 705,166. (No model.)

To all whom it may concern:

Be it known that I, JAMES CHRISTOPHER Britain and Ireland, and a resident of 75 Queen street, Brisbane, in the Colon y of Queensland, have invented certain new and useful Improvements in Lithographic Machines, (for which I have applied for patents in Queensland September 1, 1898, No.4,549; in New South Wales September 6,1898, No. 8,631; in Victoria September 6, 1898, No. 15,514, and in Great Britain October 5, 1898, No. 20,988,) of which the following is a specification.

My invention relates to improvements in lithographic machines, and has special reference to a means for arresting the movement of the printing-roller at the same place on each strike of the machine and to prevent breakage of the dampening-rollers or lifter, this invention being a further improvement upon my previous invention, application for which was filed April 15, 1898, Serial No. 677,705.

The object of my invention is the provision of an attachment for the purpose set forth which is the embodiment of simplicity, durability, and cheapuess, thus producing a very useful and practical device.

To attain the desired objects, the invention consists of an improvement for lithographic machines embodying novel features of constrnction and combination of parts, substantially as disclosed herein.

Figure 1 is a side view of a portion of a lithographic machine with my attachment or improvement placed thereon; and Fig. 2 is a front elevation of the pressure-cylinder, with my invention for arresting the movement thereof attached, g

In the drawings, A designates a cam upon the main crank-shaft of a lithographic ma-' chine, and said cam is adapted to be revolved in the rectangular frame 13, carried by the slidingly mounted pressure rod 0, secu red lar disk G, provided with a semicircular notch H in its periphery and a stud J upon the outer face.

Secured to the top of the machine is the spring tension bracket or arm K, carrying the revolving friction-roller L, which is adapted to impinge the periphery of the disk and engage the notch H to arrest the movement of the disk, and consequently the pressurecylinder, and to return the cylinder and disk quickly after it has nearly completed a revo-' lution and to arrest it while therelemploy the tension-spring M, which is connected to the stud J of the disk. v Thus it will be seen that when the pressurecylinder is revolved in the ordinary manner the slidingly-mounted presmachine by means of the bracket N and to thetact with the friction-roller, where it is arrested I by the curved notch and spring also. Formed upon the inner side of the pressurerod is a lug or stud 0, against which is adapted to abut the end of the lever P, which is pivoted to'the jaws E at P, and to the other end of this lever is inovably connected the damper-lifter or verticallymovable rod Q, whose lower end slides in an opening in the side frame R of the machine, and this lever is so operated as when the pressure-rod descendsthat the damper lifter or rod ascends, and thus raises the bracket S, carried by the rod, and consequently the dampening-rollers T, carried by the bracket and upon the upper end, of the lifter.

From this description the operation of my invention is readily understood, but, briefly stated, it is as follows: The machine is set in motion and the cam raises the pressure-rod, which causes the I cylinder to rise and the dampening-rollers to descend, and when the pressure-rod descends the dampening-rollers ascend; but while the dampening-rollers are descending the disk, with its friction-roller and tension-spring, isarrested, and thus the sudden fall of the rollers is broken or stopped.

' Thus it will be seen that I produce a very simple, durable, and inexpensive improvement in lithographic machines which is very useful and practical.

I claim 1. In combination with a lithographic machine, of a pressure-rod carrying a pressure cylinder, a disk carried by said cylinder, means to contact with said disk and arrest the movement thereof, a lifter operated by said pressure-rod and adapted to be arrested simultaneously with the cylinder and dampening-rollers carried by said lifter.

2. In combination with a lithographic machine, of a slidingly-mounted pressure-rod adapted to be operated by the crank-shaft of the machine, a pressure-cylinder carried by said rod, a disk carried upon one end of the cylinderand provided with a notch and astnd, means for contacting with the periphery of the disk and entering the notch to arrest the movement of the cylinder, a lever pivoted to the machine and adapted to be contacted with by the pressure rod, a verticallymovable l oller lifter or rod connected to the other end of the lever, and roller-holders carried at the upper end of said lifter or rod.

3. In combination with a lithographic machine, of a pressure-rod carrying a cylinder, a disk carried by the cylinder and provided with a notch in its periphery, a spring-arm carrying a friction-roller and adapted to impinge upon the periphery of the disk and force the roller into engagement with said notch, and a spring to arrest the cylinder and also to return the same to be arrested by the springarrn carrying the friction-roller connected to the disk and the machine.

4. In combination With a lithographic machine, of a pressu re-rod slidably connected to said machine, a pressure-cylinder carried by said rod, a disk havinga stud and a notch connected to one end of the cylinder, means for contacting with or engaging said notch and stud to arrest the movement of the cylinder, a lifter movably connected with the machine and pressure-rod, and adapted to ascend as the pressure-rod descends and Vice versa and dampening-rollers carried by said lifter.

JAMES CHRISTOPHER llAlrhlGAN.

\Vit-nesses:

E. GARLAND SHoLL, R. W. RENDELL. 

